如何创建CSV文件

Question

我尝试从PHP数组创建CSV文件，但未创建。其仅显示消息。

$filename = "export_data" . rand(1,100) . ".csv";
//$export_data = unserialize($_POST['export_data']);

// file creation
$file = fopen($filename,"w");

foreach ($error_array as $line){
    $array_trimmed = array_map("trim", $line);
    fputcsv($file,$line);
}

fclose($file);

// download
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=".$filename);
ob_end_clean();
header("Content-Type: application/csv; "); 

readfile($filename);

// deleting file
unlink($filename);
exit();

它是我的数组

Array
(
    [0] => Array
        (
            [0] => LAN
            [1] => CATEGORY
            [2] => TYPE
        )

    [1] => Array
        (
            [0] => 123456789114545
            [1] => EMI Related - Bounce Reason
            [2] => Request
            [3] => lan number not valid
        )

    [2] => Array
        (
            [0] => 12345678911454
            [1] => EMI Related - Bounce Reason
            [2] => Request
            [3] => lan number not valid
        )

)